1.  Copyright 2009 Digital Enterprise Research Institute. All rights reserved Digital Enterprise Research Institute www.deri.ie Semantic Search for CMS IKS workshop Rome, 12/11/2009 joint work with: Stéphane Corlosquet, Jüregen Umbrich, Lindsay Clark, Stefan Decker Dr. Axel Polleres Axel Polleres

2. Digital Enterprise Research Institute www.deri.ie Where are we in terms of Semantic Web for CMS? Good news! We already did it for you! Just install Drupal and get on board for free … and use SWSE/Sindice which will do the search part for you! 2

3. Digital Enterprise Research Institute www.deri.ie Semantic Search for CMS Goal:  Inject machine readable data in Drupal – Off-the shelf – Low entry barrier for site administrators  Make ANY Drupal site amenable to semantic Search engines (e.g. SWSE, Sindice) – Reasoning, cross-site queries in SPARQL  “Stacked” approach for finding/integrating information from different sites in a certain domain. – tailored SWSE engine – Find/query data  if you wish, reintegrate it in you site 3

4. Digital Enterprise Research Institute www.deri.ie 4 Semantic Search over CMS: http://drupal.deri.ie/projectblogs/

5. Digital Enterprise Research Institute www.deri.ie 5 Semantic Search over CMS:

6. Digital Enterprise Research Institute www.deri.ie 6 Our approach: A. Produce & Consume Linked Data with Drupal 1. Automatic Vocabulary creation from Site structure and expose RDF off-the-shelf 2. Mapping Content Models to existing ontologies 3. Data endpoint for SPARQL querying 4. Lazy loading of external data (data import) B. Tailored crawl and search 1. Configurable crawl depth, periodical crawls 2. Optional OWL reasoning 3. SPARQL/SWSE endpoint over specific sources C. Applications on top 1. Expert Finding 2. VisiNav ISWC2009 Best in-Use Paper!!!

7. Digital Enterprise Research Institute www.deri.ie 7 Demo time! A. Produce & Consume Linked Data with Drupal (Axel) 1. How to get RDF into Drupal CCK (demo live) 2. Data endpoint for SPARQL querying (demo live) 3. Import of external data (data import) (under construction) B. Tailored crawl and search (Jürgen Umbrich, DERI) 1. Configurable Search engine/crawler based ob SWSE 2. Cross-site Queries with Reasoning C. Applications on top (time allowed) 1. Expert Finding (Paul Buitelaar, DERI) 2. VisiNav (Andreas Harth, DERI/AIFB) my ISWC SW Challenge 2 nd prize!

8. Digital Enterprise Research Institute www.deri.ie 8 Availability of Part A: Drupal 6 modules available for download: http:// drupal.org/project/rdfcck http://drupal.org/project/evoc http://drupal.org/project/sparql_ep http://drupal.org/project/rdfproxy (under construction) Online prototype: http://drupal.deri.ie/projectblogs/ Other users: Michael J Fox Foundation (Parkinson disease) http://www.pdonlineresearch.org/ Stembook (Stem Cell articles and reviews) http://www.stembook.org/ ISWC2010 web site (to come!) Drupal 7 Core will have RDF functionality!!!! Currently more than 200.000* sites on Drupal 6 waiting to be upgraded!

9. Digital Enterprise Research Institute www.deri.ie 9 LIVE DEMO… Check some more detailed slides from our ISWC presentation: http://openspring.net/sites/openspring.net/files/slides_iswc2009_final2.pdf

10. Digital Enterprise Research Institute www.deri.ie 10 PREFIX foaf: SELECT * WHERE { ?s a foaf:Person; foaf:firstName ?fname; foaf:surname ?lname. OPTIONAL { ?s foaf:img ?pic} } PREFIX foaf: SELECT * WHERE { ?s a foaf:Person; foaf:firstName ?fname; foaf:surname ?lname. OPTIONAL { ?s foaf:img ?pic} } Site SPARQL endpoint Example Query: Show me persons, their names and optionally images of those persons

11. Digital Enterprise Research Institute www.deri.ie 11 PREFIX foaf: SELECT * WHERE { ?s a foaf:Person; foaf:firstName ?fname; foaf:surname ?lname. OPTIONAL { ?s foaf:depiction ?pic} } PREFIX foaf: SELECT * WHERE { ?s a foaf:Person; foaf:firstName ?fname; foaf:surname ?lname. OPTIONAL { ?s foaf:depiction ?pic} } foaf:img rdfs:subPropertyOf foaf:depiction Site SPARQL endpoint Example Query: Needs reasoning… cf. Jürgen’s demo later on Show me persons, their names and optionally images of those persons

12. Digital Enterprise Research Institute www.deri.ie 12 Lazy loading (caching) of distant RDF resources  Enables sharing data across sites/import remote Linked data sources  Like SPARQL endpoint module built on the PHP ARC2 library  Simply CONSTRUCT query to map distant schema to local schema Import of distant RDF resources Currently disabled on the demo site for maintainance… so, can’t demo today, sorry, need to show you on slides…

13. Digital Enterprise Research Institute www.deri.ie 13

14. Digital Enterprise Research Institute www.deri.ie 14 Conclusions Use our Drupal modules!  We’d be happy to collaborate/help on building similar approaches for other CMS:  E.g. WordPress (Lin Clark, DERI)  Auto/semi-automatic export RDF ensuring LOD principles  Goal: Make ANY CMS site amenable to semantic search  We plan to make customisable crawlers awailable open source to accompany this!  We can provide tailored search/query engines on top (SWSE/Sindice)!!  We are working on further applications integrating this data!